Froiling - what are the 2 pipes in the back?

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sparke

Minister of Fire
Jul 6, 2006
564
Maine
We just installed a Froiling 20/30 where I work. On the back of the boiler, middle-left hand side, there are 2 pipes that exit the boiler. They look to be 3/4". The heating contractor checked with the wholesaler and the owners manual. He could not find the answer in either place. We have speculated a few things. DHW coil (doubtful since we didn't pay for one), instrumentation ports, recirculation circuit, etc... Can anyone ell me exactly what these pipes are for?

Thanks
 
Wow, that is quite important. You would think it should me in the manual. maybe it is and he missed it...
 
yup,

safety dump, not allowed in US

SK
 
in my area, most of the systems are under pressure
Only very old systems have open expansion on the highest point of the sistem
 
henfruit said:
SK i never heard that is was not allowed here? Do you know why and where i could find out about that ?

I should have said not preferred in the US, there is no actual code compliance issue.
Common usage in Europe.

SK
 
The pipes are for emergency cooling when power is lost during the burn. A fail open zone valve needs to be on one leg and then naked baseboard fins to provide cooling. Should be slanted back to boiler for natural circ.
 
I don't have my manual here at work but I am pretty sure it is in there. If you need me to scan it for you I will. The baseboard section needs to be rated at 10% of boiler output.

The aquastat which was supplied with my 50 is for overtemp protection with power, it turns on circ pump to largest zone in the house.
 
Greener than Gore said:
The pipes are for emergency cooling when power is lost during the burn. A fail open zone valve needs to be on one leg and then naked baseboard fins to provide cooling. Should be slanted back to boiler for natural circ.

I believe that the smaller pipes are not to connect to a dump zone using fin tube. My Varmebaronen has them, and the manual states that it is to be connected to the main domestic cold water supply. The idea being that on a power loss or overheat scenario, you would open the valve and dump water thats going to most likely be at 55 degrees into this coil. That will rapidly remove the heat from the boiler itself, much quicker than an overheat loop. As another poster mentioned, I believe its required in the EU.

Wont help me much, as Im on a well, and the boiler is in the basement, so without power I cant get the cold water there anyway, and even if I did, there is no place for it to go...
 
After going back and looking at the piping diagrams, I think my previous statements are wrong, I may have mine plumbed incorrectly. Good thing I haven't lost power during a burn!
Thanks for the humble pie.
 
Unfortunately,all factory boilers in Europe think that all have water supply through a network Unfortunately this is not true
 
Greener than Gore said:
After going back and looking at the piping diagrams, I think my previous statements are wrong, I may have mine plumbed incorrectly. Good thing I haven't lost power during a burn!
Thanks for the humble pie.

No need for humble pie here! We are all always learning something.

I just dont know how much thermo siphon you can get out of that coil, so you may want to look into moving your dump zone soon.
 
Henfruit, I am not sure where Community College bought the boiler, but I do know it was bought from a local dealer. They have a degree program in Alternative or "Green" energy.

Thanks all for the replies. I would be somewhat hesitant to put 55* water in an overheated boiler because of thermal shock. Since the engineers have repeatedly tested the system it must not damage the boiler...
 
In Europe there a lot of towns that do not let the people use an auto fill on there heating systems.Thus they will have a storage tank mounted above the boiler with a st-130 overtemp valve in the boiler that will open on over temp allow cold water to flow through an independent coil in the boiler to cool the boiler.
 
sparke said:
Henfruit, I am not sure where Community College bought the boiler, but I do know it was bought from a local dealer. They have a degree program in Alternative or "Green" energy.

Thanks all for the replies. I would be somewhat hesitant to put 55* water in an overheated boiler because of thermal shock. Since the engineers have repeatedly tested the system it must not damage the boiler...

The 55 degree water would only be in the coil, not actually into the boiler. Since it would only cool the water, and not hit the steel directly, I think it would be OK....
 
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